What causes stars to twinkle?
A) Stars constantly vary in brightness as they expand and contract.
B) Interstellar gas along the line of sight to the star absorbs different amounts of radiation.
C) The human eye has difficulty seeing faint objects.
D) Moving gases in Earth's atmosphere randomly bend light rays from stars.
D) Moving gases in Earth's atmosphere randomly bend light rays from stars.
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The idea that energy in atoms has distinct energy levels is part of the branch of physics that is called
A) special relativity. B) general relativity. C) quantum physics. D) classical physics. E) particle physics.
For constant linear acceleration, the position versus time graph is a
A) horizontal line. B) vertical line. C) sloped line. D) curve. E) none of the given answers.
A nuclear fission power plant has an actual efficiency of 39%. If 0.25 MW of power are produced by the nuclear fission, how much electric power does the power plant output?
A) 0.098 MW B) 9.8 MW C) 35 MW D) 0.35 MW
Low air pressure is associated with warm air temperatures.
Indicate whether the statement is true or false.